Locomotive structure



June 26, 1934.

J. C. TRAVILLA, JR., El AL LOCOMOTIVE STRUCTURE Filed April 13. 1932 5Sheets-Sheet l Afford Q9 June 1934. J. c. TRAVILLA, JR., T AL 1,964,095

LOCOMOT IVE S TRUCTURE Filed April 13. 1932 5 Sheets-Sheet 2 //2 VZ/zfans James. C Fay/Ha J. f/rzar' 6. /'/a//qa/$7" June 26, 1934.

J. C, TRAVILLA, JR, ET AL LOCOMOTI VE STRUCTURE Filed April 13. 1932 5Sheets-Sheet 5 June 26, 1934. J. c. TRAVILLA, JR., El AL 1,964,095

LOCOMOTIVE STRUCTURE Filed April 15. 1932 5 Sheets-Sheet 4 June 6, 1934-J. c. TRAVILLA, JR., ET AL 1,964,095

LOCOMOTIVE STRUCTURE Filed April 13. 1932 5 Sheets-Sheet 5 //2 Va: fol'sPatented June 26, 1934 UNITED STATES PATENT OFFICE 1,964,095 LOCOMOTIVESTRUCTURE James C. llavilla, J12,

Einar G. Hallquist, Edwardsville, 111., ts General Steel CastingsCorporation,

Pa, and assignors Granite Philadelphia,

19 Claims.

This invention relates to railway rolling stock and consists in anovellocomotive underframe structure and refers particularly to theconstruction of the cylinder saddle and related parts.

Locomotive main steam cylinders are usually rigid with, the sides of theboiler saddle and the exhaust steam passages extend inwardly andupwardly through the upper part of the saddle and merge in a nozzlewhich exhausts in to the smoke box. The portions or" the saddleimmediately ad jacent the cylinders and exhaust passages receiveconsiderable heat from these parts and tend to expand substantiallyuniformly with them. However, the lower portions or the saddle areusually spaced from the cylinders and steam passages and receive lessheat. Accordingly, the thermal stresses set up in the upper and lowerparts of the saddle are difierent, resulting in bending moments beingimparted to the intervening parts which strain the structure and maycause breakage. This result is aggravated where the cylinder saddle iscast as an integral unit or is formed integrally with an entirelocomotive underframe.

The main object of the present invention is to provide a locomotivecylinder saddle structure in which the cylinders and steam passages andparts immediately adjacent the same are permitted to expand freelyWithout endangering the adjacent rigidly connected parts of the saddle.

Another object is to provide means of mounting the main steam cylindersdirectly on the side walls of the underframe or saddle without the useof transverse bracing ribs or ties.

These objects and others are attained substantially by eliminatingcertain portions of the cylinder saddle which in previous constructionshave tended to resist the expansion of the above mentioned parts,without at the same time inaterially weakening the structure.

In the accompanying drawings which illustrate the invention- Figure l isin part a top view of an integral locomotive underirame illustrating oneform of the invention and in part a horizontal section taken on the line1-1 of Figure 2.

Figure 2 is a vertical section taken on the longitudinal center line ofFigure l.

5 Figure 3 is a half vertical transverse section taken on the line 3-3of Figure 2.

Figure l is a longitudinal section taken on the line 4-4 of Figure 3.

Figure 5 is a view corresponding to Figure 2 and showing a modification.

Figure 6 is substantially a horizontal section taken on the line 66 ofFigure 5.

Figure 7 is a half vertical transverse section taken on the line 7-4 ofFigure 5.

Figure 8 is a longitudinal vertical section taken on the center line ofan integral locomotive underframe illustrating another modification.

Figure 9 is a View corresponding to Figures 2 and 5 and illustratinganother modification.

Figure 10 is substantially a horizontal section taken on the line 10-10of Figure 9.

Figure 11 is a half vertical transverse section taken on the line 1l-l1of Figure 9.

Figures 12 and 13 are views correspondingto Figures 1 and 2,respectively, and illustrating another modification.

In Figures 1 to 4, the invention is illustrated as embodied in anintegral cast metal locomotive underframe structure including a cylindersaddle and a box section base or main frame. The cylinder saddleincludes main steam cylinders l, valve chambers 2, and upwardly disposedtransverse and longitudinal walls 3, 4 and 5 projecting above theunderfrarne and having boiler mounting flanges 6 at the top. Exhauststeam passages extend from valve chambers 2 inwardly and upwardlythrough the upper portion of the saddle and merge in an exhaust nozzle 8which discharges into the smoke box (not shown). Nozzle 8 is braced nearthe top thereof by a web 8a. v v Y The main portion of the under-frameincludes vertical longitudinal side walls 9 which curve outwardly as at10 and merge with the end portions of steam cylinders l and with steampassages 11 extending between the cylindersl and valve chambers 2. Thesecurved portions 10 cooperate with outwardly ofiset portions 13b of theunderframe bottom web to form the sole connections between each cylinderand the adjacent portion of the underirame. Substantially horizontalwebs 12 and 13 form the top and bottom, respectively, of the underframe.

Supplementary vertical webs 14-. extend along side walls 9 and betweenthe same and these are bowed outwardly abreast the cylinders l, as at15. Substantial openings 16 and 17 are provided in the top and bottomwebs l2 and 13 between these bowed portions 15. The central portion 13dof bottom web 13 projects into opening 17 and mounts a center platestructure 18. This structure is reinforced by a transverse rib l9 and bya member 20 having an inclined irontwall depending from top web 12 andupright side walls 20a.

Transverse walls 21 and 22, the former in alignment with saddle frontwall 3, and upright walls 20a, brace the saddle structure adjacent theopenings 16 and 17. Wall 21, bowed portions of longitudinal webs 14, andthe sloping front wall of reinforcing member 20 are continuous aroundthe openings 16 and. 17, forming an orifice extending through the mainportion of the underframe.

The omission of substantial portions of the top and bottom webs andother bracing connections between the side members of the underframeabreast the cylinders permits these members to flex much more readily torelieve thermal stresses in the cylinders and steam passages andadjacent members of the underframe than is the case where the top andbottom webs of the underframe are continuous between the cylinders.

In Figures 5, 6 and 7, transverse vertical webs 23 and 24 extendentirely across the cylinder saddle and merge with the walls ofcylinders 25 inter mediate the end portions thereof. Substantialperforations 26 and 27 are provided in top and bottom webs 28 and 29between the steam cylinders 25, the bottom web at the center beingextended forwardly between supple. entary longitudinal walls 30 andmounting center plate struc ture 31. Inclined ribs 32 depending from topweb p 28 intersect supplementary walls 30 and cooperate with the same tobrace the center plate structure. In this case, the central opening inthe underframe extends entirely across the structure between the steamcylinders and between webs 23 and 24 which cooperate with outwardlycurved portions 64 of the underframe side walls to support thecylinders, transverse web 24 being bowed forwardly at the center toclear the center plate structure.

The structure shown in Figure 8 corresponds to that shown in Figures 1to 4 except that upright rear wall 33 of the smoke box saddle extendsdownwardly through the underframe to bottom web 34 and the inclinedcenter plate reinforcing structure 35 merges with this wall at itsintersection with underframe top wall 65. Saddle walls 33 and 33a extendalong the edges of openings 36 and 37 and provide substantialreinforcement without eliminating the desirable flexibility of the sidewalls and cylinder connections.

In Figures 9, 10 and 11, horizontal bottom web 38 is depressed at thesides of the central opening and adjacent the cylinders 41, and thecenter plate structure 39 is mounted upon a Web 40 extending forwardlysubstantially in alignment with the portion of web 33 immediately behindthe cylinders. The center plate structure is braced by a member 42having a sloping top wall and upright sides which merge with rear wall43 of the smoke box saddle between underframe top and bottom webs 44 and38. The lower portion of transverse wall 43 is braced from the bottomweb 38 and the supplementary side walls 45 by horizontal and verticalribs 46 and 47, respectively. A vertical transverse rib 48 extendsacross the rear portion of the center plate structure beneath thesloping wall of bracing member 42.

The main steam cylinders 41 are supported upon box-like structuresextending laterally from side walls 49 of the underframe and includingvertical webs 50 and horizontal top and bottom webs 51 and 52, each ofthe top webs having a perforation 53 surrounded by a vertical flange 54.Transverse walls 43 and 55 extending along the edges of openings 56 and57 in the top and bottom webs of the underframe are spaced a greaterdistance apart than walls 50 and are disconnected therefrom.

In Figures 12 and 13, the main steam cylinders 66 are rigidly connectedtogether and to the main portion of the underframe by verticaltransverse walls 67, and bottom web 58 extends across the underframebetween the cylinders and mounts center plate structure 59. Substantialopenings 60 and 61 are provided in the top and bottom webs of theunderframe immediately behind the rear saddle wall 6'7, and openings 62and 63 are provided in the top and bottom webs, respectively,immediately in front of the saddle structure. This arrangement ofopenings relieves stresses in the members of the underframe, due to theexpansion in the cylinders, substantially as effectively as theconstructions previously described.

In each of the forms, the portions of the underframe adjacent to thecylinders and exhaust passages which heretofore have tended to resistexpansion of the latter parts, are constructed so that the underframemay flex more readily in a manner to safely relieve the practicallyirresistable thermal expansion in the heated parts. On the other hand,the recessed portions of the underframe have been sufficientlyreinforced so that the structure is not materially weakened forresisting the longitudinal and vertical forces.

Obviously, the inventive features above disclosed may be embodied instructures varying as to many details from the particular formsdescribed, and the exclusive use of all such modifications as comewithin the scope of the appended claims is contemplated.

What is claimed is:

1. In a locomotive underframe structure, a substantially box-sectionbase member and main steam cylinders at the sides thereof, the sidewalls of said member having recessed parts abreast said cylinders andthere being an opening in the bottom web of said member and extendingfrom one of said parts to the other to relieve thermal stresses in saidmember.

2. In a locomotive underframe structure, a base member, and main steamcylinders at each side thereof, said member including a substantiallyhorizontal web, side walls merging with the walls of said cylinders andsupporting the same, and supplementary vertical webs extending alongsaid walls, there being a substantial opening in said horizontal webabreast said cylinders and extending between said supplementary webs torelieve thermal stresses in said member.

3. In a locomotive underframe structure, a base member, and main steamcylinders at each side thereof, said member including a substantiallyhorizontal web, side walls curving outwardly and merging with the wallsof said cylinders, and sup plementary vertical webs extending along saidside Walls and. between the same, said supplementary webs being bulgedoutwardly abreast said cylinders, and said horizontal web being openbetween said bulged portions to relieve thermal stresses in said member.

4. Structure as defined in claim 3 an integral cast metal unit.

5. In a locomotive underframe structure, a base member including sidewalls and a substantially horizontal web, main steam cylinders connectedto said side walls, there being an opening in said horizontal webabreast said cylinders, and

comprising a center plate member extending into said opening.

6. In a locomotive underframe structure, a base member including sidewalls and a substantially horizontal web, main steam cylinders connectedto said side walls, there being an opening in said horizontal webabreast said cylinders, a center plate member extending into saidopening from the lower portion of said base member, and a memberconnecting said center plate member with the upper portion of said basemember and reinforcing said center plate member.

7. In a locomotive underframe structure, a base member including sidewalls and a substantially horizontal web, main steam cylinders connectedto said side walls, there being an opening in said horizontal webabreast said cylinders, a vertical wall extending transversely of saidhorizontal web adjacent said opening, a center plate member projectinginto said opening, and a member connecting said last mentioned wall andsaid center plate member and reinforcing the latter.

8. In a locomotive underframe structure, a boxsection base memberincluding side walls and top and bottom webs, main steam cylindersadjacent said side walls, there being substantial openings in said websabreast said cylinders and extending substantially across said member, acenter plate structure projecting into the opening in said bottom web,and a center plate bracing member depending from the upper part of saidbase member.

9. In a locomotive underframe structure, a box-section base memberincluding side walls and top and bottom webs, main steam cylindersadjacent said side walls, there being substantial openings in said websabreast said cylinders and extending substantially across said member,and an upwardly disposed wall extending between said webs and aroundsaid openings and forming therewith an orifice for relieving thermalstresses in said base member.

10. In a locomotive underframe structure, a box-section base memberincluding side walls and top and bottom webs, main steam cylindersadjacent said side walls, there being substantial openings in said websabreast said cylinders and extending substantially across said member, acenter plate structure projecting into the opening in said bottom web,and an upwardly disposed wall extending between said horizontal webs andaround said openings and forming therewith an orifice for relievingthermal stresses in said base h member, said last mentioned wallincluding a portion merging with and bracing said center platestructure.

11. Structure as defined in claim 10 comprising an integral cast metalunit.

12. In a locomotive underframe structure, a base member including sidewalls and top and bottom webs, main steam cylinders carried by said sidewalls, there being openings in said webs abreast said cylinders andextending substantially from side to side of said member, ribs dependingfrom said top web adjacent the opening therein, and a center platestructure supported on said ribs and extending through the opening insaid bottom web.

13. In a locomotive underframe structure, a base member including sidewalls and a bottom web, transverse webs extending across said structure,and main steam cylinders merging with and supported by said side wallsand said transverse webs, said bottom web being open substantially fromside to side between said transverse webs to relieve thermal stresses insaid member.

14. In a locomotive underframe structure, a base member including sidewalls and a bottom web, main steam cylinders at each side of saidmember, and transverse webs extending between said cylinders, said sidewalls curving outwardly and merging with the end portions of saidcylinders, and said transverse webs merging with said cylindersintermediate said end portions, said bottom web being open from side toside between said cylinders and said transverse webs to relieve thermalstresses in said member.

15. Structure as defined in claim 14 comprising an integral cast metalunit.

16. In a locomotive underframe structure, a saddle member including abottom web and a wall projecting upwardly therefrom and having a boilermounting flange at the top, cylinder elements at the sides of saidmember, there being an opening in said bottom web between said elementsto relieve thermal stresses therein, a center plate member projectinginto said opening, and an element projecting from said wall and bracingsaid center plate member.

17.111 a locomotive underframe structure, a saddle member including abottom web and a wall projecting upwardly therefrom and having a boilermounting flange at the top, cylinder elements at the sides of saidmember, there being an opening in said bottom web between said elementsto relieve thermal stresses therein, a center plate member projectinginto said opening, an element projecting from said wall and bracing saidcenter plate member, and reinforcing ribs between said wall and adjacentportions of the structure.

18. In a locomotive underframe structure, a base member including sidewalls, and main steam cylinders adjacent said walls, said walls havingoutwardly offset portions merging with said cylinders and formingsupports therefor, and there being an opening disposed upwardly throughsaid member and extending substantially from cylinder to cylinder forrelieving thermal stresses therein.

19. In a locomotive underframe structure, a base member having sidewalls, and steam cylinders adjacent and merging with said walls, saidwalls constituting the sole direct connection between said cylinders andsaid base member and said base member being substantially open betweensaid cylinders.

JAMES C. TRAVILLA, JR. EINAR G. HALLQUIST.

